Battery status won't hit 100% anymore

I've had my PB about a month and a half (got it new believe it or not) and recently I noticed that even though the battery status will say "charged", the percentage will not show 100% when plugged in. At first it was 99% and now it's 97%. I've calibrated my battery and try to let it run fully down every once in a while.
The battery info in profiler shows this:
Full Charge Capacity (mAh): 5309
Remaining Capacity (mAh): 5183
Is this normal or should I be concerned or what?
Thanks everyone.

That doesn't sound out of the ordinary. See this Apple note: http://docs.info.apple.com/article.html?artnum=88344

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